# Commission Regulation (EC) No 29/2009 of 16 January 2009 laying down requirements on data link services for the single European sky (Text with EEA relevance), Division 4

Extent: E+W+S+N.I.

The transmission and reception of data units between ground and aircraft systems hosting the air-ground applications defined in the ICAO standards specified in points 2 and 3 of Annex III shall be based on communication protocols which comply with the ICAO standards defining the Aeronautical Telecommunication Network referred to in point 4 of Annex III.

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Source: https://www.legislation.gov.uk/eur/2009/29/annex/IV/part/B/division/4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-29/annex-IV/part-B/division-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.